Feria, C. M. Preparing grades using OpenOffice.org Calc. IN Tech101: Open Notes. Manila Bulletin.
Chicago-viite (17. p.)Feria, Charmagne Munoz. "Preparing Grades Using OpenOffice.org Calc. IN Tech101: Open Notes." Manila Bulletin .
MLA-viite (9. p.)Feria, Charmagne Munoz. "Preparing Grades Using OpenOffice.org Calc. IN Tech101: Open Notes." Manila Bulletin, .
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